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Date:   Wed, 17 Apr 2019 11:16:23 +0200
From:   Arend Van Spriel <>
To:     Toke Høiland-Jørgensen <>,
        Herbert Xu <>
Cc:     Johannes Berg <>,
        Felix Fietkau <>,,
        Eric Dumazet <>,,
        Bob McMahon <>
Subject: Re: [PATCH 5/5] mac80211: set NETIF_F_LLTX when using intermediate tx

+ Bob

On 4/17/2019 11:09 AM, Toke Høiland-Jørgensen wrote:
> Herbert Xu <> writes:
>> On Tue, Apr 16, 2019 at 02:18:36PM +0100, Toke Høiland-Jørgensen wrote:
>>>> The congestion control happens at two levels. You are right that the
>>>> socket buffer acts as one limit. However, other applications may also
>>>> rely on the TX queue being full as the throttle (by setting a
>>>> sufficiently large socket buffer size).
>>> Do you happen to have an example of an application that does this that
>>> could be used for testing? :)
>> Have a look at
>> commit 6ce9e7b5fe3195d1ae6e3a0753d4ddcac5cd699e
>> Author: Eric Dumazet <>
>> Date:   Wed Sep 2 18:05:33 2009 -0700
>>      ip: Report qdisc packet drops
>> You should be able to do a UDP flood while setting IP_RECVERR to
>> detect the packet drop due to a full queue which AFAICS will never
>> happen with the current mac80211 setup.
> Yup, got that part. Was just wondering if you know of any applications
> that already do this, that I could test without having to write my
> own... :)

Hi Bob,

Is this something that could be easily implemented in iperf?


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